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Have you tried living on freeze dried for a few days? I quickly went back to sandwiches. Agree with others, MREs are massive, I wouldn't want to carry them. They generally come with their own heating pouches, so that's a bonus.

Another thing, you seem to be on a paid-for supported tour that provides a lunch option. I don't know your group or how its set up, are there others on this tour that aren't part of your meal planning? If the rest of the group is sufficing on some sandwiches and snacks for lunch, and you are taking time to cook meals, being the odd guy out on what the group is doing is something to take into consideration. Especially so if your lunches are taking longer than others. All moot if you are taking care of everyone's cooking, though.